Strange crash with KSharedPtr

[Alex Merry]

On Tuesday 14 October 2008 09:49:15 Mark Kretschmann wrote:
> Thread 1 (Thread 0x7fa0b8a3e7c0 (LWP 12280)):
> [KCrash Handler]
> #5  0x00007fa0c6a32e14 in QBasicAtomicInt::ref (this=0x200000001d) at
> /usr/include/qt4/QtCore/qatomic_x86_64.h:123
> #6  0x00007fa0c6a332a2 in KSharedPtr (this=0x7fffcfe8db10,
> o=@0xae70c0) at /home/mark/kde/include/ksharedptr.h:74

> Can't really make head nor tails of it. Ideas?

As I said on IRC, the only thing I can think of is that someone is converting 
the ksharedptr to a bare pointer and deleting it.

Or it's being shared across threads.  The referencing and dereferencing should 
be thread-safe, but I don't think KSharedPtr as a whole is - it's possible for 
thread 1 to call track(), creating a new Meta::TrackPtr, but thread 2 to cause 
the last remaining Meta::TrackPtr for this track to be dereferenced (hence 
deleting the Meta::Track) before thread 1 gets around to calling 
Meta::Track::ref().

Alex


-- 
Proud KDE hacker: http://www.kde.org
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